N,N,N',N'-tetramethyl-7,8-dihydro-6H-dipyrido[1,2-a;2',1'-c][1,4] diazepine-2,12-diamine in N,N-dimethyl-formamide T=100°C; Inert atmosphere;

1: 1-methyl-2,3-indolinedione With sodium amalgam in N,N-dimethyl-formamide T=20°C; 4 h; 2: (1-(phenylsulfonyl)ethane-1,1-diyl)dibenzene in N,N-dimethyl-formamide T=110°C; 18 h;